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Warrants - IPO Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 16, 2018 USD ($) shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Class of Warrant or Right [Line Items] |  |  |
Warrants to purchase shares of stock (in shares) |  |  | 280,876
Adjustments to additional paid-in capital related to warrants | $ | $ 1.2 |  |
Redeemable Convertible Preferred Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants to purchase shares of stock (in shares) |  | 0 | 156,550
Redeemable Convertible Preferred Stock | Preferred Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants converted (in shares) | 156,550 |  |
Warrants to purchase shares of stock (in shares) |  |  | 156,550
Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants to purchase shares of stock (in shares) | 160,657 | 118,122 | 124,326
Series 6 Preferred Stock | Preferred Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant conversion ratio |  | 0.9433 |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109126253&loc=d3e4724-112606 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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